Electric controlling device.



- WITNESSES:

W. K. HOWE.

ELECTRIC CONTROLLING DEVICE.

APPLICATION FILED MAY6.1912.

Patented Dec. 7, 1915.

INVENTOR pi BY 09 A TTORIVEY.

COLUMBIA FLANDGRAPH (20., WASHINGTON. D- c UNTTED s rarns rarnnr uric.

,speci ficati on.

"wrivrnnor K. HOWE, or nocnnsrnn, nnw vonn, ASSIGNOR TOGENERAL' RAILWAY SIGNAL COMPANY, OF GATES, NEW YORK, A CORPORATION OF NEVV' YORK.

ELECTRIC CONTROLLING nnv'icn.

To all whom it may concern:

Be it known that I, Wnv'rrnior K. Hows, a citizen of the United States, and a resident of the city of Rochester, in the county of Monroe and State of New York, have invented a new and useful Electric Controlling Device, of which the following is a Clhis'invention relates to device for controlling the movement, and indicating the completion of the movement, of a device remote therefrom.

. The primary object of the invention is to increase the certainty and reliability of the indication given at the controlling device,

that the device remote therefrom has properly operated, and has assumed, and is 111, a position in correspondencewith the controlling device.

Other objects and advantages of the invention will become apparent to those skilled in the art as the description ot the particular embodiment selected to illustrate applicants invention, progresses.

In the drawing, consisting of a single fig ure, showing diagrammatically the circuits and apparatus selected by apphcant,as exhibiting a particular physical embodiment of his idea of means; numeral 1 designates a slide, having a latch 2 operated by'the handle 3, for holding the slide in one of itsmoved positions. The slide contains a cam slot 1, by which a roller 5 is caused to move up and down, thereby causing an up and down movement of a rod 6, which may actulate mechanical locking, such as is used in interlocking machines in railway signaling,

and thus in a manner well understood by those skilled in the art, cause other slides, similar to 1, to be locked in position or unlocked. so that they may be moved. The slide 1 may be moved manually in the direction of the arrow X, from the position shown, and may be returned from its moved position to the position as shown, but its complete movement in. either direction is governed by indication mechanism, which consistsof shoulders 7, 8, 9, 10 and 11, the latch "13, the dog 1 the cam 15, the indication magnet 16, the. rod 17 attached to armature 18, and the safety magnet 19. The function of said parts and the mode of op eration thereof, is fully shown, described and claimed in the patentgranted to John therebetween.

Patented Dec. *7, 1915.

Application filed May a, 1912. Serial no. 695,532.

1). Taylor, #752,127, dated February 1s, 190i. n V i y A rod 20 is connected to the slide 1 at one end, and at the other is attached to the conducting blocks 21 and 22, which, when inthe. position as shown, cause springs 23 and .24: and and "26 respectively to be electrically connected. lVhen the slide 1 is moved suliiciently in the direction of the arrow contact blocks21 and 9.2 connect springs 27 and 28 and 29 and 30 respectively, so as to make an electrical connection The above mentioned contact blocks and springs, their function and mode of operation, is fully shown and described in the patent to John D. Taylor,

7 #752,127, above mentioned.

, 31 and designate two electromagnets, so placed as to act upon the p voted member 33,'whichin one of its positions forms a conducting path from contact 3% to con tact 35, but when moved to a reverse position by means of electromagnet 31, forms a conducting path between contacts 3% and The above described parts constitute 'whatare known as an indication selector 31 and 32 respectively for a purpose to be later explained.

The group of mechanism designated generally by A is equivalent in all respects with that shown, described and claimed in the patent granted to John D. Taylor,#800,26, datedSeptember 26th, 1905. i

All of the devices, with the exception of coils 115 and 116, heretofore described are thoroughly well known and understood by those skilled in the art of railway signaling and their mode of operation is generally as follows: When all of the parts are, inthe position as shown, known as the normal posi ion, if slidel is moved in the direction of the arrow X, to what is called the reverse indication position, the motor whose commutator is designated as 37 is caused to m ve any function connected therewith from the normal to the reverse position, move the bridging 'contactsBS and 39 from in contact with the springs 40, all, 42 and 43 respectively, into contact with springs eel and 45 and 46and 47 respectively, whereupon a further rotation of the armature of the rotor, whose commutator is designated by generates afcurrent electricity by. its acqu red momentum, wlnch flows through the proper WVIIGS to energize the ind cation magnet 16, which by operatingwarmature 18 causes an'actuation of the latch and dog underneaththe slide so that the slide, which was stopped at thereverse indicatlon positlon is released so that it maybe moved I to the full reverse position.

If, when all of the parts are in the full reverse position the slide 1 is moved in a Clll'ECtlOIl opposite to the arrow X, to the normalfindication position, all of that group of parts designated by A, willreturn to the position shown, and after so doing, a current will flow through the indication magnet 16,which will release the slide 1,'so-that it may be moved to, the full normal position. hen the slide 1 is moved to the reverse indication position, the pivoted member 33 is moved into contact [with contact 36, and when the slide 1 is moved to the normal indication position after having been moved to i the reverse position, the pivoted member 33 is moved back into contact with contact 35.

All of the abo've briefly outlined operations are thoroughly well understood by those 1 sk lled in the art of railway signaling, and

it are explainedin detail in the patents granted to John D. Taylor, hereinbefore mentioned. 5

Heretoforethe electromagnets 31 and' 32 have been madepractically of suchlow resistance, that they would cause anactuation of pivoted member 33, only Whensuflicient current flowed through them to cause the armature of the motor to revolve, the commutator ofwhich is designated by 37, and the motor would operate when in series with either 31or 32. Coils 48, 49, and 51 have heretofore been made of such resistance that they would operate members 38 vand 39 by a flow of current much less than that needed to actuate member 33, consequently, a current could flowthrough coils 31 or 32 in series with 51 and 50 or 48 and 49 respectively which would operate the members 38 and 3 but not operate member 33. V i

In this embodiment of applicants invention, the electromagnets 31 and 32 have been so designed, that they will operate the armature of the selector when inseries with the pole changer coils 48 and 49 or 50 and 51, but the pole changer bridging members 38 and 39 will not be operated when the coils 48 and "49 or 50'and 51 are series with electromagnets 31 or 32.

. -As the value "of the current which may thus flow through indication selector mag nets 31 and 32 is very much less than that requlred to cause the armature of the m0- tor to revolve, it is necessary to form an operating circuitrfor the motor-whi ch does notv include electromagnets 31 and 32. Applicants invention providessuch a c1rcu1t,

. which is formed atthe proper time the movement of plvoted member 52, which is moved back and forth on its pivot'by means of electromagnets31' and 32 and is held firmly ineither extreme position by the overcenterjthrowmg device 53,'and by current flowing 1n,co1ls-115 and 116.

The complete operation of applicants device is as followsz'theoperator grasps the .handle of the slide 1 and exertsa pull upon "the slide-in the direction of, the arrow X,

which causes the slide to move in the direction of the arrow X'and so causes shoulder 7 to contact with theleft hand end-of latch 13, and causes the right hand end of latch 13 to be moved into the space between shoulders9 and 10, so that the shoulder 10 will contact with the right hand. end of latch 13. p in order to positivelyinsure that the right hand end of latch 13 will be in the proper position, the cam 15 is rotated by "the projection forming shoulders 10 and 11, and acting upon dog 14, forces the upper arm of therlog 14 under the right hand end of block 22, spring 29, wires and 61, spring 43, wire 91, electromagnet 51, wire 92, 'electromagnet'50, wire 93,spring 90, hearing uponlnetallic strip 87 of the rotatable comj'mutatorSG, spring 88, wire 94, binding post 83, 'wires8-l and 85 to the negative terminal of the battery The resistance of the above traced path would be such that electromagnet 31 would be sufficiently energized to cause both pivoted members 32 and 52 to be moved to the left, so that pivoted member 33 would form a conducting path between contact 34 and '36, and pivoted member 52 would bejnoved sothat the over-centering device would snap 1t and hold it firmly 1n the extreme'left hand position; Of course when the slide 1 is moved to thereverse indlcation positlon, current not only, flows j through COllS 51 and 50 but also through the motor but until pivoted member 52, as explained below, moves to reverse position,

no useful current flows through the motor.

Assoon as pivoted member contacted with wire 117 a circuit would be formed as follows: positive terminal of ba'tery 54.

wire 55, safety magnet 19, wires 56 and 119,

pivoted member 52, wire 117, coil 115, wires 95 and 59," spring 30, contactblock 22, spring 29, wires and 61, spring 43, bridging contact 39, spring 42, wire 62, binding post 63, wire 64, brush 65, commutator 37 and armature to which it is connected, brush 66, wire 67, binding post 68, wire 69, spring 41, bridging contact 38, spring 40, wire 70, binding post 71, wire 72, field coil 73, wire 74, field coil 75, wire 76, binding post 77, wire 78, field coil 79, wire 80, field coil 81, wire 82, binding post 83, wires 84 and 85, to the negativeterminal of the battery. Current flowing in the above traced path causes the armature to which commutator 37 is connected to revolve actuating the function to which it is connected, moving the bridging contacts 38 and into contact with springs 44 and 45 and 46 and 47 respectively, and causing rotatable commutator 86 to revolve, so that springs 88 and. 89 will contact with metallic member 87 instead of springs 88 and 90, and the acquired momentum still remaining in the armature, to

which commutator 37 is attached. after the function has been actuated, will cause the generation of an indication current vfor wh ich a complete circuit has been formed bythe movement of the bridging contacts 38 and and 39 caused by the operation of the motor,

the operation of the indication selector, and

the contact block 21, which is as follows: armature to which commutator 37isconnected, commutator 37, brush 65, wire 64, binding post 63, wire 62, spring wire 96, spring 45, bridging contact. 38, spring '44, wire 97, spring 40, wire 70, binding post 71, wire 72, field coil 73, wire 74, field coil 7 5, wire 76, binding post-77, wire 78, field coil 79, wire 80, field coil 81, wire 82, binding "post 83, wires 84 and 98, indication magnet 16, wire 99, contact 34, pivoted member 33, contact 36, wire 100, spring 28, block 21, spring 27, wires 101 and 102, spring 47, bridging cont-act '39, spring 46, wire 103, spring 41, wire 69, binding post 68, wire 67, brush 66, and connnutator 37 to the other terminal of the armature. The indication current flowing in the above traced path will so energize indication magnet 16, that armature 18 will be raised, causing the rod 17 to strike the dog 14, and so cause the upper arm of the dog to be thrown from under the right hand end of latch 13, so that the slide 1 can be moved to the full reverse position, but in such position no operating current will be flowing in wire 61 to the motor as bridging contact 39 is not in contact with spring 43 and no current will flow through electromagnets 50 and 51 because spring 90 is not in contact with metallic member 87.

lnorder to return all parts to the normal position as shown in the figure, the operator moves the slide 1 in a direction opposite ,to the arrow X, thereby causing shoulder 8 to contact with theleft hand end ofthe latch 13 and move the right hand end into the path of shoulder 9, so as to stop the slide at the nori'nal'indication position, and at the same time, the cam '15 by contacting with the projection formed by shoulders 10 and 11, will c-auseptlie dog 14'to move into a. proper position to hold the right hand end of t'helatch 13 in the path of the shoulder 9.

The movement of the slide 1 to the normal indication position, places block 21 in contact with springs 23 and 24, and block 22 in contact with springs 25 and 26,so that a circuit is formedas follows: positive terminal of battery 54, wire safety magnet 19,

'wi-res 56 and 104, electromagnet .32 of the indication selector, wires 105 and 106, spring 26, block 22, spring 25, wires 107 and 102, spring 47, wire108, electromagnet 49, wire 109, electromagnet 48, wire 110, spring 89,

metallic strip 87, spring-88, wire 94, binding post 83, and wires 84 and 85 to the negative ternnnalof the battery. The resistance of by means of the over-center throwing device 53.

As soon as pivoted member 52moves to the position as shown in the drawing a circuit isiornied as follows: positive terminal of the battery 54, wire 55, safety magnet 19, wires 56 and 119, pivoted member 52, wire 118, coil 116, wires 111 and 106, spring 26,

block 22, spring '25, wires 107 and 102, spring 47,, bridging contacts 39, spring 46, a wire 103, spring 41, wire 69, binding post 68, wire 67,'brush 66, commutator 37, armathe above traced path is such, that sufliture to which the commutator is connected 1 a) brush 65, wire 64, binding post 63, wire 62, spring 42, wire 96, spring 45, bridging contact 38, spring 44, wire 97, spring 40,

wire 70, binding post 71, wire 72, field coil into contact with springs42 and 43 and causes rotatable commutator 86 to rotate, so that springs 88 and 90 make contact with metallic strip 87 of commutator 86, and'the armature ot'the motor by reason of its acquired momentum, after the functionis op erated, causes the generation of acurrent,

which flows in a circuit as follows: commutator'37, brush 66,' wire 67, binding post 68',

wire 69, sprin L41, bridging contact 38,

1spring'40, wire 0, binding post? 1, wire 72,

held coil 73, wire 74, field coil 75, wire 76,

bindingpost 77, wire '7 8, held, coil 79, wire sated coil e1, wire as, binding post 83,-

wires 84 and 98, indieation magnet, 16, wire 99, contact 34,' pivoted. member '33, eontact 35, wire -112, spring 24, block 21, spring 23, wires 113 and 61, spring 43, bridging contact39, spring42,iwire"62,-binding post 63,

' wire 64,=brush 65 and eommutator37to the rent which flows in the above traced path other terminal of the armature. The curenergizes the indication magnet 16, causes the armature 18 bearingthe rod 17 to be raised, thus striking dog 14: andpforeing its upperarm from beneath the right handend of latch 13,'so that shoulder 9 may pass the right hand end of the latch, so that the slide 1 may be placed in the full normal posicontact point 117- or 118..

tion, after which all of. the parts will be in the'position' as shown by the figure.

Although applicant has illustrated coils of wire 115 and 116 wound on eleetromagnets 31 and '32, through which the operating current for the motor and pole changer flows, I it is-to be understood that such construction is not absolutely necessary. Coil 115 is merely party of the circuit including wire 95,

and coil 116 merely part of the circuit ineluding wire 111, but neither coil has any power to actually start the movement of armatures 52 and 33, they merely have a circuit completed through them by the completion of the movement of armature 52, so that they merely act to hold the armature in the moved position after being moved 1 thereto, so as to reduce. the resistance of the 4,0

52 and either Such construction merely asslsts the spring 53 to re contact between I armature tain member; 52 in the thrown position,

when operating current is flowing.

' pli'cant may use both spring 53 and coils 11-5 and 116 or use one meansonly to hold memberv 52 in the. thrown position. Although applicant has illustrated two armatures, as 52 and 33, it is not to be inferred that two are necessary, for no reason'exists why one'armature may not be made to perform the circuit closing functions of both.

, Several points not necessary to explain in H describing the complete normal operations should be observed, they are: 1.-Although current flows through the pole changer coils 48 and 49 and-50 and 51 when the slide 1 is i moved either from the normal position to shunt formed about eleetro-magnets i31-o-r 32 thatthe current .fiowing to said coils 48 and '49 or 50and'51 reaches such a value as to sufiicie'ntly energize the coils to cause a mo-vement'of members .38 and 39. if the switch operating mechanism has. been partly indication position forms :a circuit in which a selector coil as 31 or 32 ,and the motor are in series, sufficient current to operate the motor cannot flow until member 52. has first been thrown, thereby shuntingeither coil 31 or 32, thus reducing the resistance of the path: 3. Thatalthough the circuit which is formed having a selector coil and the motor in series does not allow the. motor to operate it will allow the seleetorto operate, but such circu t may be cons dered as an accidental circuit as far as normal operation is concerned. 1

One advantage of applicants invention can be most readily seen by a concrete illustration. 1f the slide 1 is moved to the reverse indication position, a current should then flow alongthrough selector coil 31 and thewire (31 and through wire 91 and electromagnets 51 and 50, wire 93., spring 90, me-

'tallie strip 87, spring 88, wire 94, binding post 83,- and wires 84 and 85 to the negative "terminal of the battery. 'The current flowing in the above tracedpath would cause member 52 to shunt coil 31 andthen the cur rent would flow in the same path as above described with the exception of coil 31 and is intended to suiliciently energize electromagnets 51' and 50, so that bridging-contacts 38 and 39 will be held in the position as shown, until the function to which the motor is connected'has made a complete movement, whereupon the bridging contacts 38 and 39 shouldbe mechanically moved into contact with springs 44, an'd 45 and 46 and 47 during the latter part of the lock movement as fully shown, described and claimed in Patent #800,246 hereinbefore mentioned. fAs also fully explained in 'Patent #800,246, the bridging contacts 38 and 39 are free from the mechanical actuating means during all of the actual operation of the function, e: cept the very first and the last part of'its lock movement, so that during all of the time they are free, they may be moved back and forth by alternate energization of electromagnets 50 and 51 and 48 and 49. As fully explained-in Patent #800,246, thisis for the purpose of allowing an operator .to move a function, such as a railway switch, Whielrwill not complete its movement, back and forth, so that any obstacle between the switehpoint and the stock rail may thereby perhaps become crushed,thus allowing the operator to actually move the switch, without 'being obliged to leave the operating tower, from which such switches are usually operated, and go out upon theground and actually remove the obstruction. It is also to be observed, that as fully explained in Patent #800,246, tl'ie'bridging contacts 38 v and 39 remain in contact with the springs 40 and 4-1 and 42 and 1-3 until'the switch or other function has actually completed its movement, and been almost locked, whereupon the bridging contacts 38 and 39 move to thereverse position, and then, and not until then, complete the indication circuit heretofore traced. The object of causing thebridging contacts 38 and 39 to so operate is to prevent any possibility of an indication being received before theswilich or other function has been actually moved to the full reverse position and locked therein.

, In order that thead'vantage of applicants mode of construction may be the more clearly understood, it will be pointed out how a given accident to the old and well known construction, in accordance with the Taylor patents hereinbe'fore mentioned, allows the slide 1 to be placed at reverse with the function controlled thereby in an intermediate position, and then it will be pointed out how applicants construction prevents thepossibility of the slide 1 being at reverse )OSltlOIl when the function controlled thereby is at an intermediate position. First consider the old and well known construct-ion,

thatis, a system constructed in accordance,

with the patents hereinbefore mentioned, that is a system in which the indication selector has only one pivoted member as 33 actuated thereby, as in Patent 832,115 hereinbei'ore mentioned, and in which the electromagnet as 31 is of such resistance that in order to operate it a current has to flow therethrough sullicient to operate the motor such as that of which. the commutator is 37, and

I in which coils such as 51 and and 49 and such as31 or by the slide. This is best-understood by following the operation of the parts of'such a system when such an accident as has been mentioned has happened. As the schematic representation of such a system does not differ from thefigur'e of drawing except that i the parts 52, 118, 111, 116, 95, 115, and 1 17 would not be present, such figure will be taken as an example of sucha system audit will be assumed that the mentioned parts are missing. In such a system it slide 1 is moved to the reverse indication position,

then a current would flow through the electi'oinagiiet 31 moving the pivoted member 33- to the left and causing an actuation of the motor and of the function.

Assume that before the switch or function I has completed its movement, the operator returns the slidel to the normal indication position, then current will flow through the electromagnet 32, wires 105 and 106, spring 26, block 22, spring 25, wires 107 and 102,

spring i7, wire 108, electromagnetltt), wire.

109, electromagnet 48, wire 110, spring 89, metallic strip 87, which by the partial movement of the function has been placed in positionto contact with the springs 88 and'89,

thence by spring 88, wire 9st,; binding post,

83' and wires 8 1 and 85 back: to the battery. Remembering thatit is assumed that the system now being considered does'not em' body this inventiomit can be seen from a consideration of the Patent No; 800,246,

hereinbefore' nentioned, that the current fiowingin the above traced path would energi'ze the electromagnet 41:8 and 19, eve n' with the electromagnet 32in series therewith, sufliciently tocause the bridging members 38 and 39 to be setfin motion toward the springs 44, 15, 416, and tZthereby cutting off the supply of operating current to the mo tor. The indication selector 'electromagnet 32, however, still remembering that the system under considerationldoes not, embody this invention, would not; be energized sufficiently to operate its armature33, .since the operating current is cut'ofi' from tlien otor at; the pole changer. At this time, whilethe IIIOtOIflS rotating idly'byyirtue ofits ac quired momentum, if'tlie operator makes a quick movementof the slide 1 to its reverse indication position, so that the-block 21 operated by said slide is brought into'contact with the, springs 27 and 28-at or about the same time that the bridgingmembers38 and 39 complete their movement and make contact with the springsfta, 415, 46, 11116147 a false indication will be received, since the motor is rotating and iscapableof generating the indication current, and since there is an indication circuit, in which current generated by the rotation of the armature to Whichcommutator 37 is connected, could flow as 'followsrcommutator37, brush 65,

wire 6%, bindingpost 63, wire-62, spring 42, wire 96, spring15,*bridging contact 38, spring 14:, wire 97 wire 70, binding-post 71, wire72, field 73, wire 74:, field 75,=wire 76,

binding post 77, wire 78, field'79, wire 80, 3

field 81, wire 82, binding post 83, wires 84 and 98, indication magnet 16, wire 99, con v tact/34, pivoted member 33, contact 36, wire 100,'spring 28,"block 21, spring 27, Wires 101 and IOQ/and spring 47, bridging contact 39, spring 16, wire 103fspring'et1, wire 69,

bindingfpost 68, wire 67,brush 66,-commulee ta tor 37 and to' thegother terminal of armature. The current flowingin the above traced path would energ ze the indication magnet 16, cause thearmature18bearmg the rod17to be raised, 'force the dog 1 L from benea'th'thef right hand end of latch 13 and;

allow the right hand end of latch .13 to -move out ofthe' path of the shoulder 10 of'the slide 1,so'that the slide 1 could be moved to" the full reverse position, andthe-switch or function would be in the mid-position, as the operating current would be cut ofi before the switch completed its movement, at members 38 and 39, so that other slides dependent upon, the complete movement of slide 1', through the mechanical locking con} trolled by members 6, would be released and could be operated; to cause the, function connected therewith t'o be-actuated, and under I such conditions, if the other slide dependent upon fthe complete fmovenient f of the slide 1 were a signal lever,,the signal could be cleared with the-switch, over which itcontr'ols train movements, in the 'midfposition.

fAlthough the above 'operationas described appears very compleigand as actually per-, formed would 1 require. a very skilled foperi-i ator, and all of themovements would have 1 y n y m d, s u h a p ibi y exists, it should beremedied, because the railwaysignal art-today demands ofja de V vice not only that it shall operatelperfectly and safely under normal conditions,but"that it shall operate safely under abnormal con Iditio'ns. It should be also notedgthat, in.ad-

' [tion to shift the bridging contacts and a9;

a so

' with, but it-isnecessary tor both pivoted dition to skilful operation,it is necessary that the wire911bebroken inorder to obtain; the result aboveldescribed, since it the wire,

91 wasintact whenthe slide was" returned to the reverse indication'ojposition afterhaving been moved to the normal- Iindi cation posia circuit wouldhave been formed through electromagnets 50 and 51 which would have "overcome the impulse given to the bridging contacts38 and 39 and would have returned them tothe positionshown in the drawing, thus preventing the completion of can indication circuit:

. In t heiconstructi on disclosed in this -appli-u'. cation, even iff'the wirej91 were broken, the:

skillful manipulation hereinbefore fdescribed would not'result in" artalse indication, for, if"

the sjlide'lvwere moved to thereverse indication position,fpivoted member, 33- would 'bemoved to theleftjbefore any movement of the pole changer members 38-lahd139 took I place,'yfor applicant; has so designed the electromagnets 32, that the, pole changer cannot .operate when in series theremembers 33an'd-52 to; first move so that one, toswit, 52,. can shuntj'an electromagnetrcoil as 31; before thelpath for currentthroughthe motor or the pole changer is'of sufiiciently low "resistance to 1 enable 'suflicient current to fiow, tlierethrough 'tooperate the pole changer Eor themotor. if the wire 91 were broken, and the slide 1 were movedto the normal indication position after having been movedto the reverse position, the pivoted .member 33 would move before the bridging members 38 and 39, for, in appli-v cants invention the value of current needed tov operate. members 38 and 39, isf greater' than that ne ededto move member 33, and that value of current ismuchlessthan that required to operatethe motor, so the piv block 21 made contact between springs 27 and '28, an indication'circuitwould not be formed, consequently because 'members'38 and 39 woull lbe ina' positioni'everse to that shown, and wire; 91 beingbrolren, no current could flow throughwire '61 to common 84,

so coil 31 could not "be energized to move arm 33 tothe reverse position, the continuity of the indication circuit wouldfbe broken between contact 36"and' contact 34:, there fore the slide could n'otlbe movedto"theffull reverse position-, thus releasing; the locking of conflicting slides.

Although have particularly described the construction of one physicalf'embodi-' ment of myinvention, and explained the operation and principle thereof; nevertheless, I des re to have itunderstood that the form selected is merely illustrative, but does hot exhaust thepossiblephysical embodiments of the idea of means underlying my invention.- f

What I claim [as new anddesire to secure byLette'rs Patent of the United States, is:

1.' In an electric interlocking system, a motor, "a pole changer an indication selectorhaving an armature, a circuitjcone troller, means to operate the circuit controller, an indication device controlling "said means, a source of electr city,electrical conductors connecting the motor, polej'changer, lndlc'ation selector, and indication device with {the source otfciirrent and with each' other, the motor, indication selec torffand polefchanger being of such'relative resistance, that the pole, "changerwill not operate in series with the indication selector and the motor will not operate in series with therinldication selector, and means governed the'indication selector to establisha' shunt around the indication selector; .c U In an "electric interlocking "system,iin

combination: a motor having an-armatur'e;

operating circuits for said motor; a pole changer for changing the connection between the armature of said motor and said operating circuits; electromagnetic means for shifting said ,pole changer; indicationmechanism; indication circuits for said mechanism; a circuit controller for controlling said indication circuits; electromagnets for controlling said circuit controller; series circuits including said electromagnetic means for operating said pole changer and the correspondin electromagnets; an armature [governed by said electromagnets;

and a partial shunt circuit for each of said electromagnets controlled by said armature.

3. In an electric interlocking system, in combination: an electrically operated function; manually operable circuit controlling means for governing the movements of said function; indication mechanism for said circuit controlling means; an indication cir cuit for said indication mechanism, said in-' dication circuit being controlled by said circuit controlling means; a circuit controller atrthe function operated thereby and in eluded in said indication circuit; a second circuit controller included in said indication circuit; and means for operating said second circuit controller and said first circuit controller successively and in the order named. I

4. In an electric lnterlocking system, 111

combination an electrically operated function; indication mechanism; an indication circuit for said indication mechanism; electrically operated means associated with said function for controlling said indication circuit; a circuit controller included in said indication circuit; electromagnets for operating said circuit controller; circuits each includingin series one of said electrically operatedmeans and the corresponding electromagnet; the resistance of each of said last-mentioned series circuits normally limiting the flow of current therein to an amount less than 1s necessary for operating said electrically operated means, Without preventing the operation of said circuit controller by said electromagnet; and means operated by each of said electromagnets for reducing the corresponding resistance.

In an electric interlocking system, in combination: an electrically operated funcilopies of this patent may be obtained for tion; indication mechanism, an indication circuit for said indication mechanism; electrically operated means associated with said function forcontrolling said indication circuit a'circuit controllerincluded in said in* dication circuit; electromagnets for operating said circuit controller; circuits each ins 'cluding in series one of said electrically op-,

6. In an electric interlocking system, in

combination: a function; a motor having an armature for operating said function; a source oi current; operating wires for said motor; a manually operable clrcuit controlling lever for controlling the" connection between said operating wires and said source of current; apol e changer for controlling the connection between said operatlng wires and the armature of said motor; electromagnets for operating said pole changer; inclicatlon mechanism for said lever; lndicatlon circuits for said indication mechanism controlled by said lever and by said pole changer; a circuit controller for selectively controlling the connection between said indication circuits and said lever; other electromagnets for operating said circuit controller; circuits each including in series one of said other electromagnets and the corresponding one of said first-mentioned eleck tromagnets of said pole changer, the resistance of said other electromagnets being such that said pole changer electromagnets will not operate said pole changer although said other electromagnets can operate sald clrcuit controller; and a'shunt for each of said electromagnets controlled by said circuit controller. p

NINTHROP, K. HOWE. lVitnesses LILLIAN L. PHILLIPS LILLIAN M. MUTSGHLER.

five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

